Ch.2 Essential chemistry for Biology 1. Water is precious to life because living organisms use water as the medium (solvent) for chemical reactions necessary to sustain life. Water also helps maintain temperatures. Droughts are disastrous because they can wipe out crops‚ which in turn cause famine. 2. MATTER: Composed of chemical elements‚ occupies space and has mass (ex: solid‚ liquid‚ and gas states.) CHEMICAL ELEMENTS: substance that cannot be broken down into other substances by chemical reactions
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water exists in liquid‚ solid‚ and gaseous states water referred to universal solvent ( bipolar molecule enables it to dissolve a wide variety of substances) ice floats ( temperatures drop molecules come together as a solid‚ elections repell (the molecules get less close thus making the ice have less density than water. If this did not occur ice could sink and destroy living organism. (sea animals) Thermal properties Water resist temperature change‚ due to high specific heat which in turn helps
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A brand of protein powder‚ “Tough Guy”‚ claims that if a person were to dilute 1 gram of protein powder in 100ml of water‚ the final concentration should be approximately 0.40 mg/ml (+/- 5%) protein. The objective of this experiment is to determine whether the manufacturer is telling the truth. MATERIALS AND METHODS One gram of Tough Guy protein powder was added to 100 ml of water. 50 µl of the sample was added to respective test tubes: 0.2‚ 0.3‚ 0.6 and 0.9 mg/ml protein. 2.5 ml of diluted Bio-Rad
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WATER OUR LIFELINE Water is a transparent fluid which forms the world’s streams‚ lakes‚ oceans and rain‚ and is the major constituent of the fluids of living things. As a chemical compound‚ a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. Water covers 71% of the Earth’s surface.[1] It is vital for all known forms of life. On Earth‚ 96.5% of the planet’s water is found in seas and oceans‚ 1.7% in groundwater‚ 1.7% in glaciers and the ice caps of Antarctica
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Biologically Important Molecules Carbohydrates‚ Proteins Lipids And Nucleic Acids Professor Anthony Depass Biology 1 9/25/14 Introduction: By completing lab exercise 6 : Biologically Important Molecules‚ we are able to perform tests such as the Benedicts Test for Reducing Sugars‚ Iodine Test‚ Biuret Test‚ Sudan IV Test‚ and lastly the Grease-Spot Test that detect the presence of biologically important carbohydrates‚ protein lipids and nucleic acids. Most known compounds in living organism
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Water is an odorless‚ colorless‚ tasteless chemical compound that makes up well more than half of the human body. In addition to being prominent in the make-up of the human body‚ it also covers all but approximately 30% of the Earth’s surface‚ and can be found naturally in all three states of matter: liquid‚ solid and gas. Water is a covalent bond known most commonly by its empirical form; H2O. It can also be identified by the Lewis Dot Structural form shown in the figure in the upper right corner
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how hydrogen bonding occurs between water molecules‚ and relate this and other properties of water‚ to the roles of water in living organisms. Water is a very small molecule‚ consisting of two hydrogen atoms covalently bonded to an oxygen atom. However the electrons shared are not done so equally‚ oxygen is more electronegative and has a firmer hold on the electrons and pulls them slightly towards its nucleus. Due to this‚ the charge across the molecule of water is not equally distributed‚ and the
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Properties of Water Introduction: Water’s chemical description is H2O. As the diagram to the left shows‚ that is one atom of oxygen bound to two atoms of hydrogen. The hydrogen atoms are "attached" to one side of the oxygen atom‚ resulting in a water molecule having a positive charge on the side where the hydrogen atoms are and a negative charge on the other side‚ where the oxygen atom is. This uneven distribution of charge is called polarity. Since opposite electrical charges attract‚ water molecules
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investigated alcoholic fermentation by using yeast‚ which can flourish in an low energy environment in anaerobic conditions. In this lab our goal was to discover the rate at which yeast will ferment different sized molecules of carbohydrates. In order to perform our experiment we made use of water‚ glucose‚ sucrose‚ and starch. It was hypothesized that glucose‚ sucrose‚ then starch would all be used to produce energy during fermentation. Being that glucose is a simple sugar‚ or monosaccharide‚ we predicted
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Importance of Water All living things need water. The Earth is full of water. Water is the most essential element‚ next to air‚ to our survival. Water makes up more than two thirds of the weight of the human body‚ and without it‚ we would die in a few days. There are many water importances in our life to complete daily life and to maintain we body health. Humans and other creatures must drink water to avoid dehydration. Dehydration is defined as a loss or insufficient levels of water and important
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